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I tried to explain in the comments: if you have a hwsub_device, you can to be able to open() it several times and thus have several hwstub_handle to it. But this may be impossible if you implement opening the trivial way, using libusb_open() for example. In this case, open() will only call do_open() the first time to get a handle, but it will not return this handle, it will return a proxy handle so that open() can be called multiple times